What is covering the jaw of the turtle?
What will be an ideal response?
Answer: a horny beak
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One of the consequences of malnutrition is lack of vitamin B6 . Enzymatic reactions requiring ______________will be halted
A. transfer of acyl groups B. transfer of alkyl groups C. transfer of methyl groups D. pyridoxal phosphate E. tetrahydrofolate
A normal Arabidopsis flower is composed of four concentric whorls. Which of the following is the correct order of whorls, starting from the outside and moving in?
A. carpels - stamens - petals - sepals B. stamens - carpels - sepals - petals C. petals - sepals - carpels - stamens D. sepals - petals - stamens - carpels E. carpels - petals - sepals -stamens
Which of the following is NOT true?
a. Down syndrome is an example of aneuploidy. b. The majority of cases of human sex chromosome abnormalities may never be diagnosed. c. Most embryos with a normal chromosome number miscarry. d. Aneuploidy is usually fatal in humans. e. Aneuploidy typically arises through nondisjunction.
Which of these statements is false concerning
covalent bonds? a. Atoms share electrons. b. Molecules may possess many covalent bonds. c. Water contains polar covalent bonds. d. Covalent bonds may be “double bonds.” e. In polar covalent bonds, electrons are shared equally.