An organic nutrient that cannot be synthesized by the organism and must be provided is called a/an
A) Trace element
B) Macronutrient
C) Growth factor
D) Element
E) Water
C) Growth factor
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What is true according to the adaptor hypothesis?
A. The anticodon and amino acid have no relationship. B. A given tRNA can carry any of the twenty amino acids. C. The position of an amino acid within a polypeptide is determined by the binding of mRNA with a tRNA carrying a specific amino acid D. An amino acid recognizes the codon in mRNA.
Which of the following statements best exemplifies the principle of selective pressures?
a. the environmental pressures felt by selection b. the environmental pressures felt by populations c. the environmental pressures felt by species d. the environmental pressures felt by organisms
Do fat cells function as an endocrine gland? Explain
What will be an ideal response?
Which of the following is NOT a direct method to measure microbial growth?
A) direct microscopic count B) standard plate count C) filtration on a support membrane followed by incubation on medium D) metabolic activity E) most probable number (MPN)