A cycle of biological activity that repeats around every 24 hours.
A. Circadian rhythm
B. Photosynthesis
C. Respiration
D. Glycolysis
E. Photorespiration
Answer: A
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The major obstacle to the use of xenotransplants can possibly be overcome by ____
a. giving a series of injections that depress the immune systems of recipients b. changing genetic markers in humans to make them more receptive to nonhuman tissue c. cloning donor animals using human DNA d. introducing a complement genes to both the donor animal and recipient human e. altering the patient's MHC complex
HIS4 trp1; HIS4 trp1; his4 TRP1; his4 TRP1
A haploid yeast strain has mating type a and genotype his4 TRP1. A different haploid yeast strain has mating type ? and genotype HIS4 trp1. The two strains mate and produce diploid offspring with genotype his4 TRP1 / HIS4 trp1. The diploid cells undergo meiosis to produce a variety of tetrad types. In the following questions, the genotypes of the spores in a tetrad are shown. For each tetrad, tell what type it is: parental (PD), non-parental (NPD), or tetratype (T). A) PD B) NPD C) T D) cannot be determined
About how long is required for a Mexican leaf frog to capture a cricket, from the beginning of
movement by the frog to the closing of the frog's mouth?
a. 50 milliseconds b. 1 second c. 80 milliseconds d. 260 milliseconds e. 3 seconds
Capsid proteins are synthesized during which phase of viral replication?
A. replication B. biosynthesis C. assembly D. proteination E. All of these are correct.