An embryo having a blastodisc exhibits holoblastic cleavage. Indicate whether the statement is true or false
False - meroblastic
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Which of the following forces contribute to the stability of a DNA double helix?
A. hydrophobic interactions of bases in the same strand B. hydrogen bonding between bases in adjacent strands C. ionic interactions between the positively charged component of one base and the negatively charged component of the neighboring base D. hydrophobic interactions of bases in the same strand and hydrogen bonding between bases in adjacent strands E. hydrophobic interactions of bases in the same strand, hydrogen bonding between bases in adjacent strandsand ionic interactions between the positively charged component of one base and the negatively charged component of the neighboring base
The age structure diagram of a human population in a developed country like Sweden, which has a population growth rate near zero and in which neither the birth rate nor the death rate has changed much in the recent past, has the shape of
A) an hourglass. B) a pyramid. C) a rectangle tapering near the top. D) a funnel. E) a triangle with the point at the bottom.
The most common pioneer species are mosses and lichens
Indicate whether the statement is true or false
________ are viruses that attack bacteria
A) HIV B) bacteriophage C) influenza D) adenovirus