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Questions in biology

[Done] An mRNA is 429 nucleotides long. The number of amino acids in the polypeptide chain formed from this mRNA is: (A) 143 (B) 142 (C) 141 (D) 429 (E) 428

[Done] Which of the following observations best supports the conclusion that dolphins and sharks do not have a recent common ancestor? A. Dolphins form social groups, but sharks are solitary. B. Dolphins hunt during the day, but sharks are nocturnal. C. The number of dolphin species is far less than the number of shark species. D. The jawbone structure in dolphins is very different from the jawbone structure in sharks.

[Done] Why does stirring the water in an experiment make the results more reliable?

[Done] Nearly all of the plant tissue called ______ is made up of cell walls.

[Done] Why can genes be considered derived characters?

[Done] Which way do people look when they lie?

[Done] The carrying capacity for the human population may be about: a. 8 billion people. b. 9 billion people. c. 10 billion people. d. Humans do not have a carrying capacity.

[Done] How is ATP made during the light reactions?

[Done] A human cell that contains 22 autosomes and a Y chromosome must be: A. a zygote. B. a somatic cell of a male. C. a somatic cell of a female. D. a sperm cell. E. an egg cell.

[Done] Oxygen gas ([tex]$O_2$[/tex]) is produced by plants and algae. What is the source of oxygen atoms in these molecules? A. Water B. Glucose C. Carbon dioxide D. Atmospheric oxygen E. Atmospheric nitrogen