Which soil horizon is composed of organic litter?
a. O Horizon
b. A Horizon
c. B Horizon
d. C Horizon
e. Bedrock
ANSWER: a
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The Principle of ________ states that the 2 alleles present at each gene locus separate from one another during gamete formation and remain distinct.
A. Alleles B. Segregation C. Crossing over D. Dominance E. Independent assortment
Cells with gap junctions are typical of tissues
a. that suffer wear, abrasion, and mechanical insults. b. such as bone and cartilage that must withstand external forces. c. that require rapid exchange of chemical messages, as is the case for cardiac muscle. d. that secrete enzymes or hormones. e. described by all of these.
What happens during translation?
a. copies of DNA molecules are made b. The cell uses a mRNA code to make proteins c. Messenger RNA is made from a DNA code d. tRNA is made from a mRNA code
One step of the HIV infection process is the T-cell is turned into a duplication mechanism that continues to make copies of the virus.
a. true b. false