When preparing vaccines, which of the following is the basis for the most effective and long-lasting immunity?
a. live viruses
b. killed viruses
c. subunit viruses
d. DNA viruses
a. live viruses
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One advantage of angiosperm seeds is the presence of seed ____, a nutritive tissue produced during fertilization that nourishes the developing embryo.
a. a coat b. endosperm c. ovule d. pollen sac e. ovary
Which of the following can waterproof cell walls, allowing for structures such as watertight conduction channels?
a. lignin b. hemicelluloses c. pectin d. cellulose e. chitin
When a diploid cell divides by mitosis, the result is __________
A) identical haploid cells B) identical diploid cells C) unique diploid cells D) unique haploid cells E) a zygote.
The HOBBIT gene in an embryo helps to control the development of what structure?
A. root B. epicotyl C. cotyledon D. endosperm E. root hair