A population is:
A) a group of different species that share common features.
B) all the different species that live in a defined geographic area at the same time.
C) all the members of a species that live in a defined geographic region at the same time.
D) a group of organisms that can successfully interbreed in nature but do not interbreed with other such groups.
Answer: C
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How does the protein Sic1 regulate the cell cycle?
a. Sic1 is a cyclin that binds to a Cdk to form a cyclin/Cdk complex, which regulates the G1 to S transition. b. Sic1 inhibits an S phase cyclin/CDK complex required for synthesis to occur c. Sic1 binds to a cyclin, to form a complex that regulates the G2 to M transition. d. Sic1 is a growth factor that binds to external receptors and promotes the transition from G1 to S. e. Sic1 is a cyclin that binds to a Cdk to form a cyclin/Cdk complex to regulate the G2 to M transition.
Which of the following fungi give off a scent
that is an attractant to female pigs?
a. morels b. yeast c. club fungi d. wheat rust e. truffles
The antibiotic chloramphenicol binds to the 50S subunit of the ribosome as shown in Figure 20.3. The effect is to
a. Prevent attachment of tRNA. b. Prevent peptide bond formation. c. Prevent transcription. d. Stop the ribosome from moving along the mRNA. e. Prevent polypeptide formation in eukaryotes.
Dinoflagellates are best described as
A) protozoans that use cilia to move and feed. B) a clade of protists including unicellular autotrophs, heterotrophs, and mixotrophs C) parasitic diatoms that must spend part of their life cycles in vertebrate hosts. D) large, multicellular algae that resemble plants but do not have true leaves, stems, or roots.