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lianna [129]
3 years ago
9

What four characteristics are best for an index fossil to have ?

Biology
1 answer:
ludmilkaskok [199]3 years ago
8 0

Answer:

Easily recognizable, short lived (found only in a few layers of rock worldwide), wide distribution (geographic range).

Explanation:

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Give three reasons why you might have a situation in which bacterial colonies were found on the first section of a streak plate,
Agata [3.3K]

Hi. You have not shown the sections this question refers to, nor have you provided more information about those sections. This makes it difficult for your question to be answered. However, I will try to help you as best I can.

Generally speaking, we can consider that there was no growth of bacterial colonies in sections 2 and 3, because, for some reason, the bacteria was not inoculated in sections 2 and 3. What could also have happened, is that the bacteria in the sections 2 and 3 were eliminated, but the bacteria from section 1 managed to survive and form colonies.

Another possibility is that after inoculating the bacteria in section 1, you didn't handle the bacteria correctly in the other sections, leaving that bacteria to dry out and die.

Finally, the culture media in sections 2 and 3 could be inappropriate for bacteria to develop and form colonies.

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3 years ago
Which of the following is widely regarded as the most significant, insightful, and powerful type of information that science gen
d1i1m1o1n [39]
The answer is D.............
8 0
3 years ago
I need help on question number 17 and 18.Thank you
MArishka [77]
17=3
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7 0
4 years ago
Some regions of a polypeptide may coil or fold back on themselves. This is called _____, and the coils or folds are held in plac
zalisa [80]

Answer:

The options are

A. secondary structure ... hydrogen bonds

B. secondary structure ... peptide bonds

C. tertiary structure ... hydrogen bonds

D. primary structure ... covalent bonds

E. tertiary structure ... covalent bonds

THE CORRECT ANSWER IS A.

A. secondary structure ... hydrogen bonds

Explanation:

The secondary structure of a polypeptide shows the localized regions of its organised structure being upheld by hydrogen bonds among the major groups

-NH and C = O

At the same time, it inhibits the hydrogen bonds of the side chains from influencing the reaction process.

The polypeptide secondary structure shows the dexterity to curl or fold as sustained by the polypeptide chains.

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