A human embryo has webbed fingers. Why are human babies not usually born with webbed fingers?
What will be an ideal response?
During development, programmed cell death removes the tissues between the fingers.
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More than ________ antibiotics are produced by Streptomyces
a. 50 b. 500 c. 2500 d. 10,000
A restriction enzyme:
is involved in chopping up the DNA from a donor organism. targets a particular base-pair sequence on either side of the gene. is usually involved in the first step of biotechnology. usually recognizes a sequence that is four to eight base pairs long. All of the above.
Species in the ____ Lophotrochozoan phylum have a body divided into three regions: visceral mass, head-foot, and
mantle.
a. Rotifera b. Mollusca c. Platyhelminthes d. Annelida e. Nemertea
In an Rh incompatability during pregnancy, the
mother a. must be positive and her first and second fetuses positive. b. must be negative and her first and second fetuses positive. c. must be negative and her first and second fetuses negative. d. must be positive and her first and second fetuses negative. e. and the father must both be negative and the fetus positive.