Mcgraw hill chapter 4 answers

Chapter 4 Biology Mcgraw Hill (Tams)

all organisms possess a genetic system based on replication of DNA

supernatural or divine origin

hypothesis that proposes meteors or cosmic dust brought life to earth

panspermia (extraterrestrial origin

life originated from inanimate materials

life most likely emerged under ___ conditions

in a reducing atmosphere, the exact conditions are ___.
there was an ample availabilty of ___ but very little ___.

unknown, hydrogen atoms, oxygen

-the ocean's edge
-under frozen oceans
-deep in the earth's crust
-within clay
-deep-sea vents

origin-problematic due to necessary conditions (temperature)

origin-byproduct of volcanic activity

origin-was positively charged so it provided catalytic surface

origin-conditions suitable for Archaea

attempted to reproduce early reducing atmosphere and produce organic compounds from inorganic materials

steps of Miller-Urey experiment

1. assembled reducing atmosphere rich in H and excluding gaseous oxygen
2. placed atmosphere over liquid water
3. maintained mixture at a temp lower than 100C
4. simulated lightning by bombarding it with energy in the form of sparks

3 hypotheses of chemical evolution

RNA, Protein, Peptide-Nucleic Acid worlds

c. evolution - molecules could not have consistently formed without a mechanism of heredity (replication)

c. evolution - replication would be impossible without enzymes

c. evolution - RNA is too unstable, thus a precursor must have existed

Peptide-nucleic acid world

certain molecules sontaneously formed bubbles (esp. protein and lipids) that shielded the hydrophobic regions of the molecules from contact with water

chemical concentrating, bubblelike structures

protobionts allowed chemical complexity

there is no major agreement on one ___ theory

resemble prokaryotes-lack a nucleus of more complex eukaryotes

microfossils have been found in rocks as old as ___ yrs

most primitive organisms-extreme condition prokaryotes

archabacteria lack ___ in cell walls (a protein carbohydrate complex)

archaebacteria that produce methane

some archaebacteria were ___(salt lovers) or ___(heat lovers)

archaebacteria are thought to have split from ___ 2 billion years ago

second major group of prokaryotes (contains most modern proks)

bacteria has strong ___ and a simpler ___

cell walls, gene structure

photosynthetic blue-green algae

Eukaryotes arose about ___ years ago

internal membrane-bound structures such as mitochondria and chloroplasts are thought to have evolved via ___

enrgy-producing bacteria were engulfed by larger bacteria which formed a beneficial symbiotic relationship

eukaryotic cells can ___ which carries out genetic recombination, the key to evolution

the development of ___ has arisen many times among eukaryotes and fosters specialization

some cells devote all energies to one task, other cells to another


McGraw Hill Connect Accounting Answers Chapter 4

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The chapter is based more on accounting adjustments. Students have to learn the functionality of accrual accounting, recognize revenue and expenses. Most of the students find it hard to analyze the difference between accrual basis and cash basis. This chapter clears all such doubts. It shows how adjustments with regards to depreciation, accrued revenue, prepaid expenses etc. The lesson is vast and incorporates most of the elements of financial statements. The lesson is better understood with help from professionals.

Terms to be well versed in

Following are the terms that are expected for students to be well versed with. It is not only the term but its respective entry in the books of accounts, the adjustment entries and their position at the financial statements. To name a few-

  • Depreciation
  • Unearned Revenue
  • Accrued Expenses
  • Prepaid Expenses
  • Trial Balance
  • Earnings Per Share
  • Operating Expenses And So On.

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DATE: NAME: ANSWER KEY Chapter 4 Test Answer Key CLASS: BLM 4.4.1A Answers to Multiple Choice Questions 1. c 2. b 3. d 4. a 5. b 6. a 7. c 8. c 9. b 10. b 11. d 12. d 13. a 14. c 15. c 16. a 17. b 18. d 19. c 20. d Answers to Numerical Response Questions 1. 4, 6, 2, 1 2. 1, 3, 4, 6 3. 1, 2, 3 Answers to Written Response Questions 1.  For speciation to occur, two populations must be prevented from interbreeding. This means that the populations must become isolated from one another through geographical or biological barriers. If the population remains isolated long enough, speciation will eventually occur; this is caused by changes accumulated in the population due to natural selection, which affects reproduction. When this happens, individuals in one population are no longer able to reproduce successfully with individuals in the other population. Copyright © 2007, McGraw-Hill Ryerson Limited, a subsidiary of the McGraw-Hill Companies. All rights reserved. This page may be reproduced for classroom use by the purchaser of this book without the written permission of the publisher. 1 DATE: NAME: ANSWER KEY Chapter 4 Test Answer Key CLASS: BLM 4.4.1A  The geographic isolation of a population does not have to be maintained forever for speciation to occur. It must be maintained long enough, however, for the population to become reproductively incompatible with the original population. Even if the populations are reunited, biological barriers (behavioural, biological) will prevent the two populations from successfully reproducing. In the case of the shrimp populations, they are fighting now rather than courting.  Natural selection is a process that results when the characteristics of a population of organisms change because individuals with certain inherited traits survive specific local environmental conditions and, through reproduction, pass on their traits to their offspring. For natural selection to occur there must be variety or diversity within the species. Populations change – not individuals. An abiotic environmental condition can be said to select for certain characteristics in other individuals. In this way, the environment exerts selective pressure on a population. Natural selection does not anticipate a change in the environment (such as the formation of the land bridge). Instead, natural selection is situational. A trait that at one time seems to have no particular relevance to survival becomes the trait that later helps the population survive and reproduce in a changed environment. This trait then persists within a population, because it is inherited by the offspring of the survivors. In this example, the land bridge resulted in changing environmental conditions. These conditions may have applied slightly different selective pressures on the two populations of snapping shrimp. As a result, each population changed to the point where members of one population are no longer capable of reproducing with members of the other. In other words, they have developed into two separate species. Marking Guide Score 5 Excellent Assessment Guidelines The student ...  constructs a diagram that clearly shows how the geographical barrier disrupts the flow of genes between the two populations  provides a detailed description of how geographic isolation can result in the formation of two species  provides a detailed explanation of why geographic isolation does not have to be permanent; includes indication that biological barriers will result in continued reproductive isolation  provides a detailed explanation of natural selection  includes a discussion of how natural selection would have formed the two species of shrimp after the land bridge formed Copyright © 2007, McGraw-Hill Ryerson Limited, a subsidiary of the McGraw-Hill Companies. All rights reserved. This page may be reproduced for classroom use by the purchaser of this book without the written permission of the publisher. 2 DATE: NAME: Chapter 4 Test Answer Key ANSWER KEY  4 Good     3 Satisfactory      2 Limited     1 Poor 0 Insufficient NR    CLASS: BLM 4.4.All rights reserved. This page may be reproduced for classroom use by the purchaser of this book without the written permission of the publisher. 3


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