Which type of bond contributes to a protein's secondary structure?

A) peptide
B) covalent
C) ionic
D) hydrogen
E) amine

The genetic code is sometimes called "universal," meaning that all organisms share the same:

A) genes
B) coding mechanism
C) ribosomal structure
D) mitochondrial DNA
E) nucleic acid composition

When viewing a blood smear, under a microscope which cell type is most abundant?

A) monocytes
B) erythrocytes
C) leukocytes
D) platelets

Glucagon is produced by the ____.

A) adrenal cortex
B) adrenal medulla
C) pancreatic exocrine cells
D) kidneys
E) pancreatic islet cells

In a certain population, the allele causing sickle cell anemia has an allele frequency of 0.2. If the population is in genetic equilibrium for this allele, what fraction of the population would be carriers for the allele (heterozygous individuals) ?

A) 0.24
B) 0.32
C) 0.42
D) 0.48
E) 0.80

Alfred Hershey's and Martha Chase's experiments with bacteriophages showed that

A) DNA was injected into bacteria.
B) DNA and protein were injected into bacteria.
C) DNA remained on the outer coat of bacteria.
D) proteins were injected into bacteria.
E) proteins were responsible for the production of new viruses within the bacteria.

Members of which group are known to form blooms known as red tides?

A) Green algae
B) Red algae
C) Euglenoids
D) Dinoflagellates
E) Brown algae

Microglia

A) Influence function of blood-brain barrier
B) Macrophages in CNS
C) Produce cerebrospinal fluid
D) Form myelin sheath around axons in CNS
E) Form myelin sheath around part of the axon in the PNS