________ is used to measure the state of development of a biological community
a. Gross primary production
b. Climax
c. Community respiration
d. Gross primary production to community respiration ratio
d
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The end result of cleavage is a(n) ____
a. blastula b. gastrula c. zygote d. embryo e. mesoderm
Consider the following: on an annual basis, C exchange from photosynthesis is 120 Gt, decomposition is 60 Gt, respiration is 60 Gt, ocean uptake of CO2 is 92 Gt of C, ocean release is 91 Gt of C, release of C to the atmosphere from anthropogenic
sources (fossil fuel use and land use change) is 6 Gt, and the atmosphere is increasing by 3.2 Gt of C. If terrestrial processes are responsible for the remaining C for net balance of the C cycle, then which of the following is likely? A) The terrestrial surface is a net sink of 1.8 Gt of C. B) The terrestrial surface is a net source of 1.8 Gt of C. C) The terrestrial surface is a net sink of 2.8 Gt of C. D) The terrestrial surface is a net source of 2.8 Gt of C.
Which is the correct sequence for the evolution of reptilian features?
A. notochord, jaws, vertebrae, bony skeleton, lungs, 4 limbs and an amniotic egg B. vertebrae, jaws, notochord, bony skeleton, lungs, 4 limbs and an amniotic egg C. notochord, vertebrae, jaws, 4 limbs, bony skeleton, lungs, and an amniotic egg D. notochord, vertebrae, jaws, bony skeleton, lungs, 4 limbs and an amniotic egg E. notochord, vertebrae, jaws, cartilaginous skeleton, lungs, 4 limbs and an amniotic egg
Which of the following statements about retroviruses is correct?
A) Retroviruses produce mRNA from the integrated viral DNA but produce progeny RNA genome from the genomic RNA template. B) Retroviruses produce both progeny RNA genome and mRNA from the genomic RNA template. C) Retroviruses produce progeny RNA genome from the integrated viral DNA but produce mRNA from the genomic RNA template. D) Retroviruses directly use the genomic RNA for viral protein translation. E) Retroviruses produce both progeny RNA genome and mRNA from the integrated viral DNA.