What is the function of a viral envelope?
a. It increases infectivity of the virus.
b. It holds the nucleic acids inside the virus.
c. It allows the host to recognise the virus.
d. It helps the virus attach to the host.
e. It replaces the capsid.
Ans: a. It increases infectivity of the virus.
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Which of the following is not yet known about meiosis?
a. Proteins in the nuclear envelope connect chromosomes to the cytoskeletal network. b. Specific motor proteins move chromosomes so the homologs can find each other. c. A proteinaceous structure called the synaptonemal complex forms between homologous chromosomes. d. Crossovers form between homologs in order to maintain pairing prior to the first meiotic division. e. A long list of specific chemicals has been shown to impair specific stages of meiosis.
Flowers and fruits are unique to
A. gymnosperms. B. angiosperms. C. conifers. D. bryophytes. E. cycads.
The structure labeled "4" in the figure is a(n) ____
a. asexual spore b. haploid spore
c. zygospore d. gamete e. spore sac
Noncoding DNA
a. is "junk" DNA. b. is the cause of many genetic diseases. c. requires more study to determine its roles. d. is used for cloning. e. occurs only in some people.