Which touch receptors of the skin are sensitive to deep pressure?
a. Pacinian corpuscles
b. Meissner corpuscles
c. Merkel disks
d. free nerve endings
e. Ruffini corpuscles
a
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By using mice, researchers found a correlation between mutations in the gene APOA5 and ____
a. high triglycerides in blood b. breast cancer c. receptors of the immune system d. sickle-cell anemia e. Alzheimer’s disease
The hormone that stimulates the development of the follicles in the ovaries of females is the ________
Fill in the blank(s) with correct word
Which solutes move into plant root cells is determined by ________
a. active transport b. passive transport c. diffusion of the solutes in the same proportion as they are present in the soil d. chance
Plasmids are used as vectors in plant and bacterial genetic engineering. However, there is a major difference in the fate of genes introduced into bacteria on most bacterial plasmids and into plants on tumor-inducing (Ti) plasmids
What is this difference? A) In bacteria, genes are stably expressed; in plants, gene expression is always lost quickly. B) Gene expression tends to decrease rapidly and unpredictably in bacteria; gene expression is much more stable in plants. C) Bacterial plasmids are circular DNAs; Ti plasmid DNA is linear. D) Bacterial plasmids and the genes they carry usually are not integrated into the chromosome; Ti plasmids and the genes they carry are integrated into the chromosome.