Biology Module B Review

The table shows the results of measuring the percentages of the four bases in the DNA of several different organisms. Some of the values are missing from the table. Based on Chargaff’s rule, the percentages of guanine bases in chicken DNA should be approximately what?

• 28.8%
• 19.9%
• 21.5%
• 13.4%

The drastic reduction in genetic variation that results when a new, isolated population is established by a very small number of individuals from a larger population is known as

• the found effect.
• speciation.
• natural selection.
• gene flow.

Which of the following is a biotic-biotic interaction?

• A snake warming itself on a sunny rock
• A rainstorm washing nutrients from the soil
• A human shivering because of cold weather
• a squirrel gathering acorns from an oak tree

Dr. Smith's parents have normal hearing. However, Dr. Smith has inherited a form of deafness. Deafness is a recessive trait that is associated with the abnormal allele (d). The allele associated with normal hearing is (D). Dr. Smith's parents could have which of the following genotypes?

• DD and dd
• dd and dd
• Dd and Dd
• DD and DD

What is the major difference between a community and an ecosystem? 

• A community involves only the biotic, not the abiotic
• An ecosystem only includes herbivores and carnivores-- no decomposers
• An ecosystem involves only the biotic, AND THE abiotic 
• An ecosystem is just a larger community

What is the role of the spindle during mitosis?

• it changes the chromatin to chromosome
• duplicate the DNA
• breaks down the membrane
• separates the chromatids.

Before cells can divide, what must be copied?

• mitochondria
• cytoplasm
• DNA
• Cell Wall

symbiotic relationship in which both organisms benefit

• competition
• Mutualism
• nitrogen fixation
• energy pyramid

Which of the following best defines a gene?

• A diploid cell containing two sets of chromosomes
• A unit made up of chromosomes that control for a specific trait
• A segment of DNA that codes for a particular protein
• All the other answers are correct.

All of the offspring of an organism have the same genetic material, which is identical to the parent organism. From this, we can conclude that this organism -

• makes its own food
• is unicellular
• live in a marine habitat
• reproduces asexually