Which of the following statements is a correct distinction between autotrophs an

Question

Which of the following statements is a correct distinction between autotrophs and hetrotrophs? A) Only heterotrophs require chemical compounds from the environment. B) Cellular respiration is unique to heterotrophs. C) Only heterotrophs have mitochondria. D) Autotrophs, but not heterotrophs, can nourish themselves beginning with CO_2 and other nutrients that are inorganic, E) Only heterotrophs require oxygen. The centromere is a region in which A) chromatids remain attached to one another until anaphase. B) metaphase chromosomes become aligned at the metaphase plate. C) chromosomes are grouped during telophase. D) the nucleus is located prior to mitosis. E) new spindle microtubules form at either end. Starting with a fertilized egg (zygote), a series of five cell divisions would produce an early embryo with how many cells? A) 4 B) 8 C) 16 D) 32 E) 64 If there are 20 chromatids in a cell, how many centromeres are there? A) 10 B) 20 C) 30 D) 40 E) 80 At which phase are centrioles beginning to move apart in animal cells? A) telophase B) anaphase C) prometaphase D) metaphase E) prophase Where do the microtubules of the spindle originate during mitosis in both plant and animal cells? A) centromere

Explanation / Answer

(25)D.Autotrophs, but not heterotrophs can nourish themselves beginning with CO2 and other nutrients that are inorganic.

Heterotrophs can’t synthesize their own food, that means they feed on the organic molecules synthesized by autotrophs.

(26)A.chromatids remain attached to one another until anaphase

(27)E.64

2>4>8>16>32>64

(28)B.20

(29)E.Prophase

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