Which of these factors will limit the size of a population?
A. availability of food and energy
B. disposal of waste
C. interaction with other organisms
D. All of these answers are correct.
D. All of these answers are correct.
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Animals colonized land after plants did. The first land animals were _____, who first colonized land about _____ million years ago
A. insects; 575 B. hemichordates; 542 C. chelicerates; 420 D. insects; 360 E. myriapods; 100
Many retroviruses have sequences complementary to the 3' end of the tRNA molecules present in the host cell infected by the virus. What is the purpose of the complementarity?
A. The tRNA acts as a primer for DNA synthesis by reverse transcriptase. B. The tRNA activates the reverse transcriptase. C. The tRNA prevents binding of integrase until after the double-stranded DNA is delivered to the nucleus. D. The tRNA is needed for proper compacting of the RNA genome. E. None of the choices given is correct.
Fungi are usually found in pelagic habitats
Indicate whether the statement is true or false
Genetic coding for virulence factors can be transferred among various bacteria by:
A. single-stranded DNA. B. plasmids. C. double-stranded RNA. D. chromosomal DNA