Which of the following characteristics distinguishes coronaviruses from rhinoviruses?
A) replicate best at 33°C
B) transmitted via respiratory droplets
C) cause common colds
D) envelope is present
E) virions contain single-stranded positive RNA
D
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The only survivors of a colony on Venus are a man and a woman, who both happen to originally be from southern
Ukraine. Their descendants will show the effect of ____.
a. genetic drift b. punctuated equilibrium c. excessive mutation d. heterozygote advantage e. frequency-dependent selection
Gibberellins affect many processes in plants. In seeds embryos, gibberellins are believed to signal hydrolysis of the stored food reserves through inducing the synthesis of the enzyme ?-amylase. Which food source are gibberellins targeting with the release of ?-amylase?
A. fructose B. protein C. glycogen D. starch E. omega-3 fatty acids
Simple epithelial cells of the renal tubule have abundant ____ to increase the surface area for reabsorption and
numerous ____ to provide energy for actively transporting materials. a. microvilli; mitochondria b. cilia; mitochondria c. microvilli; Golgi complexes d. cilia; Golgi complexes e. cilia; capillaries
Certain cells of sporophytes undergo meiosis to produce haploid reproductive cells called _____.
Fill in the blank(s) with the appropriate word(s).