In 1953 the structure of DNA was determined to be a ________
Fill in the blank with correct word.
Answer: double helix
Biology & Microbiology
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Among couples using a method of birth control consistently and correctly, the most important determinant of pregnancy risk is ______.
[A] their marital status [B] their ethnic or racial group [C] their income group [D] their frequency of sex
Biology & Microbiology
what causes allergies?
What will be an ideal response?
Biology & Microbiology
Four of the five choices listed below are
characteristics of phloem. Select the exception. a. consists only of cell walls b. characterized by channels across plant cell walls c. sieve plates found between some cells d. includes accessory companion cells e. transports sugar
Biology & Microbiology
How many different type of amino acids are found in proteins?
A. 100 B. 200 C. 1,000 D. 20 E . 4
Biology & Microbiology