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3 years ago

Describe the niche of the giraffe.

Biology

2 answers:

IceJOKER [234]3 years ago

7 0

The niche can be defined as the position of an organism in a particular ecosystem.

The niche of the giraffe is exclusively African savannas. There they feed on the leaves of the long trees. Then long neck of the giraffe helps in acquiring their food from the top of the trees, where other animals cannot reach. Due to the long neck, they experience issues in drinking water from the rivers, so, they drink a lot of water once in several days (2-3). They also acquire water from the vegetation they eat. The baby giraffe serves as a good prey for the lions and hyenas.

Dafna1 [17]3 years ago

4 0

Giraffes have a special niche in the African savanna. They are able to reach a six-foot band of foliage beyond the reach of all other terrestrial browsers except elephants. Their long tongue is useful for grasping leaves in the crowns of trees.

(They also have a modified joint at the base of the skull that allows their head to extend vertically to reach the highest branches.) Giraffes only drink water every two to three days, but can drink up to 10 gallons at a time. They gather most of their water from the vegetation they eat.

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What happens during anaphase II of meiosis? The nuclear membrane begins to form around haploid sets of chromosomes. Homologous c

Kazeer [188]

Answer:

The option that says: Sister chromatids separate from each other and migrate to opposite ends of the cell.

Explanation:

This question wants to test us on a very interesting part in genetics that is Cell Cycle, Mitosis and Meiosis.

In mitosis, the cell divide to produce or generate two daughter cells that has the identical genetic infomation just as the one in the parent cell. After mitosis, we have Cytokinesis.

For meiosis, it is divided into two that is meiosis I and meiosis II. Meiosis I is about the separation of homologous chromosomes pairs while meiosis II is about the separation of chromosome into two chromatids.

In anaphase II of meiosis, "Sister chromatids separate from each other and migrate to opposite ends of the cell" after the division of the centromere.

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3 years ago

After eating a salty fish dinner you are very thirsty for plain water, a condition described as

Olenka [21]

Answer: Hypernatremia

Hypernatremia is a condition that infers too much salt and less water in the body, which could result to dehydration where the person is thirsty for plain water after eating a salty fish. There are sensors in the body that could detect saltiness of the blood and this sends signals to the brain that the body needs water to dilute the salt and balance the fluids in the cells. Therefore, making the person feel thirsty for water.

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4 years ago

A true-breeding black rabbit is crossed with a true-breeding brown rabbit. All of the F1 rabbits are black. Two of these black F

zzz [600]

A true-breeding black rabbit is crossed with a true-breeding brown rabbit. All of the F1 rabbits are black.

This tells you black (B) is dominant over brown (b). So, the cross was BB x bb: Bb Bb Bb Bb. All heterozygous dominant and you see them all black.

Two of these black F1 rabbits were crossed together and produced exactly two offspring. What is the probability that both offspring were black? Assume that color is controlled by a single autosomal gene.

You can cross two F1 rabbits to know the probabilities of the offspring, Bb x Bb: BB Bb bB bb you have 25% chances of having brown rabbits.

In a species of tree, seed color is determined by four independently assorting genes: A, B, C, and D.

The wild-type alleles are A+, B+, C+, and D+. The mutant alleles are all lof and are A−, B−, C−, and D−.

The lof alleles are unable to work as well. This pathway is diagrammed as shown below. When both red and blue pigments are present, the seeds are purple.

Trees with the genotypes A+A-B+B-C+C-D+D and A+A-B+B-C+C-D-D- were crossed.

a) What color are the seeds of these two parental genotypes?

Don't has the diagram to know the colors, but you could see the ABCD alleles to answer that.

b) Determine what color offspring seeds are and in what proportions

(A+A-)(B+B-)(C+C-)(D+D-) x (A+A-)(B+B-)(C+C-)(D-D-)=

(A+A+)(B+B+)(C+C+)(D+D-)

(A+A-)(B+B-)(C+C-)(D+D-)

(A-A+)(B-B+)(C-C+)(D-D-)

(A-A-)(B-B-)(C-C-)(D-D-)

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4 years ago

Nuclear hormone receptors form a complex with their ligands, other proteins, and DNA control elements in order to regulate the e

ArbitrLikvidat [17]

Answer:

Explanation:

Nuclear receptors are a type of protein that functions as an intracellular steroid and thyroid hormone receptor. The interaction of these hormones in conjunction with nuclear receptors changes the pattern of gene expression, allowing certain genes to be transcribed while others are silenced.

As a consequence, unique mRNA translation products, proteins, and, in most cases, enzymes are generated. Nuclear receptors connect to DNA directly and control the expression of certain genes, regulating the organisms growth, homeostasis, and metabolism.

The following domains are found in a normal nuclear receptor:

The amino-terminal activation domain contains the transcriptional activation mechanism and is strongly variable in sequence (AF1). The recruiting of coregulators is the domains key feature.

⇒ Activation function 1 (AF1); Coregulator recruitment

DNA binding domain: It is amongst the most closely conserved centrally located domains, with two zinc fingers that attach to specific DNA sequences known as hormone reaction components (HRE).

⇒ nine conserved cysteine residues; zinc finger domain; center of the receptor.

The hiinge domain serves as a versatile connection between the DNA binding and ligand-binding domains. It has a nuclear localization signal in it. ⇒ Nuclear localization signal

Ligand binding domain: The sequence of the ligand-binding domain is moderately conserved throughout nuclear receptors. It denotes the carboxyl-terminal end of a ligand domain. It has hydrophobic steroid-binding pockets that draw the hormone and AF2 activation domains. It also attaches to proteins that serve as coactivators and corepressors.

⇒ binding of corepressor proteins; steroid-binding hydrophobic pocket; AF2 activation domain; binds coactivators; carboxyl-terminal end

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3 years ago

Were the first organisms that released oxygen as a by-product of photosynthesis.

FrozenT [24]

Answer:

Blue green algae or cynobacteria

6 0

3 years ago