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Alexus [3.1K]
3 years ago
6

The first step a biologist takes when deciding how to study life is to?

Biology
2 answers:
77julia77 [94]3 years ago
5 0
First- b
second - d
third - c
fourth - a

lord [1]3 years ago
4 0
The first step the biologist needs to make an observation in which to create a hypothesis. In other words they are observing something that creates a question they want to answer through experimentation
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All living things contain carbon.which of the following statements is true about carbon atoms?
vfiekz [6]

I. Each carbon atom can form single bonds with up to four other carbon atoms. II. Each carbon atom can form double bonds with up to two other carbon atoms. III. Carbon atoms can join together to form chains or rings. IV. A single molecule of some compounds can contain thousands of carbon atoms.

Answer:

All the given choices

Explanation:

Carbon is a very interesting element which is the backbone of most organic compounds.

Organic compounds are made up of carbon. Carbon forms a wide range of compound due to the following properties;

  • An atom of carbon has 4 valence electrons and can bond with 4 other carbon.
  • Carbon can form single, double and triple covalent bonds.
  • They can join together to form rings or chains.
6 0
3 years ago
Please answer 5&6. Thank you.
erastovalidia [21]

Answer:

5. The correct answer would be an option A. ova

Note: I assume that all the samples are of human origin.

DNA (deoxyribonucleic acid) content of somatic cells of humans consists of 46 chromosomes or 23 pairs of chromosomes. Gametes (sperm or ova) are haploid cells produced by the process of meiosis and contain half the number of chromosomes found in parent cell. Hence, they contain 23 chromosomes.

6. The correct answer would be an option J.

Sperm formation or spermatogenesis is the process by which spermatozoa (haploid gamete) is produced from germ cell with the help of meiotic division.

Meiosis results in the formation of four haploid (n) cells from single diploid (2n) parent cell. Here, 2n is given as 8 so, n would be equal to 4.

Meiosis I results in the formation of two secondary spermatocyte cells (both haploid or 4 chromosomes in this case) from single primary spermatocyte (diploid or 8 chromosome in this case).

Both the secondary spermatocytes undergo meiosis II to produce 4 spermatids (each haploid or 4 chromosome in this case). Spermatids differentiate and mature into spermatozoa.

3 0
3 years ago
What did Charles Darwin do that allowed him to make some significant
4vir4ik [10]

Answer:

Charles Darwin went to the Galapagos Island(s).

Explanation:

Charles Darwin took a boat to the Galapagos Island(s) to study plants and animals that proved to show some similarity between each other, such as two finches, which is actually one of his most popular discoveries.

5 0
3 years ago
While volunteering at a hospital, Alex learns that there are several different human blood types and they are determined by alle
SIZIF [17.4K]

Answer:

They are codominant

Explanation:

There are 3 different alleles: IA, IB and i - IA and IB are codominants, i is recessive. Codominance means neither allele can mask the expression of the other and both alleles A and B are expressed in the blood type.

6 0
3 years ago
The bacterium E. coli can use carbon sources other than glucose for
4vir4ik [10]

Answer: D.) This gene sequence ensures transcription of arabinose genes only

when arabinose is available, saving the cell from expending energy

unnecessarily

6 0
2 years ago
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