Which of the following would NOT be a trait of a resistance plasmid?
A) It may carry antibiotic resistance genes.
B) It may carry heavy metal resistance genes.
C) It increases the host's growth rate.
D) It may undergo genetic recombination.
Answer: C
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Conifers are particularly common in mountain and high-latitude forests. What key characteristics of conifers give them an advantage over other plant phyla in these biomes?
_____ production of resin. _____ the conical shape of the tree. _____ leaves with a relatively large surface area. _____ flexible branches. _____ a waxy cuticle. _____ tori. _____ loss of leaves during the winter months.
If ozone layers in the atmosphere are depleted
A. more infrared wavelength radiation will reach Earth's surface, causing more cases of skin cancer. B. more ultraviolet wavelength radiation will reach Earth's surface, causing more genetic damage in organisms. C. less visible wavelength radiation will reach Earth's surface, causing an increase in photosynthesis. D. less ultraviolet wavelength radiation will reach Earth's surface, causing global cooling. E. less infrared wavelength radiation will reach Earth's surface, causing global warming.
New alleles that appear by mutation
a. are inherently disadvantageous to their bearers. b. are seldom advantageous or disadvantageous in themselves. c. either have or lack survival value only in the context of their environment. d. are seldom advantageous or disadvantageous in themselves and either have or lack survival value only in the context of their environment. e. are inherently disadvantageous to their bearers and are seldom advantageous or disadvantageous in themselves.
In a vasectomy, the vas deferens is cut and tied to block the release of ________ during ejaculation
A) semen B) testosterone C) sperm D) nutritional secretions for sperm