hi

A hypothetical population has the following numbers of individuals with the given genotypes: DD = 500, Dd = 800, dd = 700. Please calculate the allele frequency for the "D" allele in this population.

.45

Cytosine makes up 32% of the nucleotides in a sample of DNA from an organism. Which of the following is the closest approximation to the percentage of adenine that would be found in the same sample of DNA?

18

Revised downward several times over the past decade, our present understanding of the number of genes that comprise the human genome is approximately...?

20,000

the theory of evolution is most accurately described as...?

An overarching explanation, supported by much evidence, for how ppopulations change over time

Human lives are greatly affected by _____________________, the manipulation of organisms or their components to make products beneficial to humans.

Biotechnology

Which component is NOT directly involved in translation?

DNA

What is it that can be duplicated in a genome?

DNA sequences of any length, chromosomes, and/or sets of chromosomes

Which of the following must exist in a population before natural selection can act upon that population?

Genetic variation among individuals

Evolution that involves changes in allele frequencies over relatively few successive generations is referred to as...?

Microevolution

Most intergenic DNA is...?

Repetitive DNA

Polymerase chain reaction (PCR) was invented only after the discovery of a heat-stable variety of DNA polymerase isolated from ____________________________, a type of bacterium living in the hot springs of Yellowstone National Park.

Thermus aquaticus

The enormous volume of data generated by genomics has redefined and greatly expanded the field of _____________________ , which is the application of computational methods to the storage and analysis of large sets of biological information (data).

bioinformatics

Which of the following are considered pyrimidines?

cytosine and thymine

DNA molecules that are formed when DNA from two different species are combined are technically referred to as "plasmid DNA."

false

Male (bull) moose will use their tremendous antlers to spar with each other, sometimes to the death, for the right to mate with a female (cow). This is an example intersexual selection.

false

Restriction enzymes function to make many, many copies of a single, targeted strand of DNA.

false

Transposable elements are an interesting facet of genomics, but as far as we know today, they have had no direct impact on the evolution of organisms living today.

false

before DNA can be replicated, it must be un-coiled and the two strands separated. The enzyme that performs this function is called ________________________?

helicase

the nitrogenous bases of a DNA double helix are held together (bonded to one another) by ____________________ bonds?

hydrogen

Which of the following describes the process when one mate chooses to mate with a specific member of the opposite sex due to the version or extent of a trait or behavior that is expressed in the mate chosen?

intersexual selection

Why might a point mutation in a segment of DNA make a difference in the resulting activity/functionality of the protein formed from that segment of DNA?

it might cause the codon for a correct amino acid located in the middle of the protein to be replaced instead with a stop codon

___________________ are chemical or physical agents that interact with DNA to cause mutations.

mutagens

The basic mechanism for the control of gene expression, as discovered in bacteria, is known as the __________________ model, which is the regulation of one gene by another that operates as a "master" switch

operon

Which of the following is defined as an interbreeding group of organisms of the same species that is located in the same geographic area?

population

The elongation of the leading strand during DNA synthesis...?

progresses away from the replication fork in a continuous manner

sexually dimorphic characteristics such as the red color of male cardinals and the ornate plumage of peacocks can be explained by an evolutionary process known as...?

sexual selection

During the process of protein synthesis, which of the following has a specific site (region) for the attachment of an amino acid molecule?

tRNA

A stem cell is an unspecialized cell that can reproduce itself indefinitely and, under the right conditions, differentiate into one or more different types of specialized cells.

true

Artificial selection has produced many varieties of vegetables such as cabbage, cauliflower, broccoli and brussel sprouts from a native species of plant known as "wild mustard," (Brassica oleracea).

true

During RNA processing, both ends (head and tail) of the primary mRNA transcript are modified (altered).

true