Which of the following is not true of the eukaryotic internal ribosome entry site (IRES)?
A. It is important for efficient translation of mRNA molecules lacking a 5' cap.
B. The eIF4F factor binds to this site.
C. They are never found in mRNA molecules containing a 5' cap.
D. It positions the mRNA start codon correctly on the 40S subunit.
C
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Using actual landmarks within DNA sequences, scientists can generate a _______ map.
A. genetic B. DNA C. physical D. chromosomal
Following crossing-over, chromosomes with genetic combinations that resemble the parents' chromosomes are called nonrecombinant
Indicate whether the statement is true or false
Companion cells load most of the carbohydrates into sieve tube members
a. through plasmodesmata. b. by osmosis. c. by antiport. d. through carrier proteins. e. by symport.
Which of the following statements concerning the characteristics of life is FALSE?
A) Reproduction is defined as an increase in the size of an organism. B) Viruses have some, but not all, of the characteristics of living things. C) Organisms may not exhibit all of the characteristics of life at all times. D) Reproduction can occur asexually or sexually in living things. E) Living things store metabolic energy in the form of chemicals such as ATP.