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3 years ago

Which is true regarding the process of meiosis I?

Biology

1 answer:

sashaice [31]3 years ago

7 0

Answer: The correct option is A (chromosome Number is reduced from diploid to haploid)

Explanation:

In sexual reproduction, offspring are produced by fusion of two different sex cells which usually come from two different parents. These sex cells are know as gametes.

Meiosis is a type of cell division that gives rise to gametes in which the chromosome number is halved. Thus, the gamete cell is said to contain a haploid number (n) of chromosomes.

A diploid cell has two sets of chromosomes: one from the male parent and the other from the female parent. When a diploid cell undergoes meiosis the following occurs:

--> the chromosomes replicate once and

--> the nucleus and cell duplicate ( divide equally) twice.

As a result, the diploid parent cell gives rise to four haploid gamete cells. Therefore the statement "chromosome Number is reduced from diploid to haploid ' is true concerning meiosis I.

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Number of different amino acids that make up all proteins

klemol [59]

Answer:

List of the 20 Amino Acids

Amino Acid 3-Letter Abbreviation 1-Letter Abbreviation Class of Amino Acid (Side Chain) Hydrophobicity Index (100 being extremely hydrophobic, 0 being neutral, and -55 being hydrophilic) Structure pKa of COOH group pKa of NH3+ group pKa of R group Molecular Weight [g/mol] alpha helix beta sheet Reverse turn

Glycine Gly G Aliphatic, nonpolar Neutral (0 at pH = 2; 0 at pH = 7)

2.4 9.8 -- 75.07 0.43 0.58 1.77

Alanine Ala A Aliphatic, nonpolar Hydrophobic (47 at pH = 2; 41 at pH = 7)

2.4 9.9 -- 89.1 1.41 0.72 0.82

Valine Val V Aliphatic, nonpolar Very Hydrophobic (79 at pH = 2; 76 at pH = 7)

2.3 9.7 -- 117.15 0.90 1.87 0.41

Leucine Leu L Aliphatic, nonpolar Very Hydrophobic (100 at pH = 2; 97 at pH = 7)

2.3 9.7 -- 131.18 1.34 1.22 0.57

Isoleucine Ile I Aliphatic, nonpolar Very Hydrophobic (100 at pH = 2; 99 at pH = 7)

2.3 9.8 -- 131.18 1.09 1.67 0.47

Methionine Met M Hydroxyl or Sulfur-Containing, nonpolar Very Hydrophobic (74 at pH = 2; 74 at pH = 7)

2.1 9.3 -- 149.21 1.30 1.14 0.52

Serine Ser S Hydroxyl or Sulfur-Containing, polar Neutral (-7 at pH = 2; -5 at pH = 7)

2.2 9.2 -- 105.09 0.57 0.96 1.22

Cysteine Cys C Hydroxyl or Sulfur-Containing, polar Hydrophobic (52 at pH = 2; 49 at pH = 7)

1.9 10.7 8.4 121.16 0.66 2.40 0.54

Threonine Thr T Hydroxyl or Sulfur-Containing, polar Neutral (13 at pH = 2; 13 at pH = 7)

2.1 9.1 -- 119.12 0.76 1.17 0.96

Proline Pro P Cyclic Hydrophilic (-46 at pH = 2; -46 at pH = 7)

2.0 9.6 -- 115.13 0.34 0.31 1.32

Phenylalanine Phe F Aromatic Very Hydrophobic (92 at pH = 2; 100 at pH = 7)

2.2 9.3 -- 165.19 1.16 1.33 0.59

Tyrosine Tyr Y Aromatic Hydrophobic (49 at pH = 2; 63 at pH = 7)

2.2 9.2 10.5 181.19 0.74 1.45 0.76

Tryptophan Trp W Aromatic Very Hydrophobic (84 at pH = 2; 97 at pH = 7)

2.5 9.4 -- 204.25 1.02 1.35 0.65

Histidine His H Basic Hydrophilic at pH=2 (-42), Neutral at pH=7 (8)

1.8 9.3 6.0 155.16 1.05 0.80 0.81

Lysine Lys K Basic Hydrophilic (-37 at pH = 2; -23 at pH = 7)

2.2 9.1 10.5 146.188 1.23 0.69 1.07

Arginine Arg R Basic Hydrophilic (-26 at pH = 2; -14 at pH = 7)

1.8 9.0 12.5 174.2 1.21 0.84 0.90

Aspartate Asp D Acidic Neutral at pH=2 (-18), Hydrophilic at pH=7 (-55)

2.0 9.9 3.9 133.10 0.99 0.39 1.24

Glutamate Glu E Acidic Neutral at ph=2 (8), Hydrophilic at pH=7 (-31)

2.1 9.5 4.1 147.13 1.59 0.52 1.01

Asparagine Asn N Acidic, polar Hydrophilic (-41 at pH = 2; -28 at pH = 7)

2.1 8.7 -- 132.118 0.76 0.48 1.34

Glutamine Gln

8 0

3 years ago

________ is the quality of the voice that is produced from sound vibrations in the pharyngeal, oral, and nasal cavities

djyliett [7]

Resonance is the quality of the voice that is produced from sound vibrations in the pharyngeal, oral, and nasal cavities.

Hope this helped, have a great day! :D

3 0

3 years ago

What are the goals of binomial nomenclature and systematics?

adelina 88 [10]

Answer:

The goal of systematics is to organize living things into groups that have biological meaning. the science of naming and grouping organisms.

Explanation:

5 0

3 years ago

A client visits the primary healthcare provider with severe facial acne. the primary healthcare provider prescribes tretinoin. w

alukav5142 [94]

Tretinoin is a naturally occurring metabolite of retinol in the retinoid class, including natural and synthetic analogues. It is the acid form of vitamin AIt acts on cell growth and differentiation. Its main use is the treatment against acne thanks to its keratolytic and anti-inflammatory properties. Tretinoin is also used in the treatment of acute myeloid leukaemia type 3 (AML 3).

SIDE EFFECTS:
Among the expected effects, side effects may occur. Signs of an allergic reaction include: hives, difficulty breathing, swelling of the face, lips, tongue or throat;

It should be known that tretinoin can make you more sensitive to the sun, so use sunscreen every day, and wear protective clothing outdoors.
Cholesterol and triglycerides should be done before and during treatment because this drug could increase their values
Some patient with leukaemia treated by tretinoin has suffered from The syndrome of retinoic acid which is characterized by fever, dyspnea, acute respiratory distress...

7 0

3 years ago

. Which summarizes the genetic research completed by the Austrian monk Gregor Mendel?

Bond [772]

Answer:

C. Mendel hypothesized that the traits of pea plant offspring are inherited.

Explanation:

A. After years of research, Mendel identified the genes for flower colors. False. During Mendel's research, genes were not yet discovered.

B. Mendel bred various dog breeds to discover the science of genetics. False. Mendel worked with pea plants, not dogs.

C. Mendel hypothesized that the traits of pea plant offspring are inherited. True. Mendel uncovered the main principles of the inheritance of simple traits.

D. Using Punnett squares, Mendel developed the principles of genetics. False. The Punnett square was invented by Reginald C. Punnett,

6 0

3 years ago