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bekas [8.4K]
3 years ago
8

An element is defined as a substance that

Biology
1 answer:
meriva3 years ago
3 0

Answer:

an element is a pure substance which can not be spilt into simpler substances by chemical means

Explanation:

examples hydrogen, oxygen, copper

You might be interested in
The diagram shows a bacterium. Which labels best complete the diagram
Sliva [168]

Answer:

X - Flagellum, Y - Bacterial DNA, Z - Cytoplasm

Explanation:

A bacterium is a living thing that are majorly known for causing diseases but are important for human life.

A bacterium is also consist of several organelles such as cell wall, cytoplasm, flagellum,  bacterial DNA, cytoplasm, ribosomes and others.

The diagram shows three main organelles that are X - Flagellum, Y - Bacterial DNA, Z - Cytoplasm. Flagella functions for the locomotion of the bacteria, bacterial DNA is a genetic material of the bacteria, and cytoplasm is a gel-like matrix composed of enzymes, water, nutrients and other waste material.

Hence, the correct answer is "X - Flagellum, Y - Bacterial DNA, Z - Cytoplasm".

4 0
3 years ago
Members of which phylum establish a successful symbiotic relationship with the roots of trees?
Alchen [17]

Answer:

The correct answer is Glomeromycota

Explanation:

Arbuscular mycorrhizae are characterized by the formation of unique structures, arbuscles, coils and vesicles of fungi of the phylum Glomeromycota. They are a type of endomicorrhiza in which the fungus penetrates the cortical cells of the roots of a vascular plant.

In this symbiotic association, the fungus helps the plant to capture nutrients such as phosphorus, sulfur, nitrogen and soil micronutrients. It is believed that the development of symbiosis with arbuscular mycorrhizae played a crucial role in the initial colonization of the earth by plants and in the evolution of vascular plants.

This symbiosis is a highly evolved mutualistic relationship found between fungi and plants.

8 0
3 years ago
Populations of the grasshopper Vandiemenella viatica possess different chromosomal fusions and inversions. Grasshoppers that are
svetlana [45]

Answer:

The options

a. New combinations of genes yielding genotypes of greater fitness

b. Few heterozygotes because of underdominance

c. Frequency-dependent selection, leading to fluctuations in fitness

d. Heterozygotes with greater fitness, owing to overdominance

e. A random assortment of genotypes because of genetic drift

The CORRECT ANSWER IS b.

b. Few heterozygotes because of under dominance

Explanation:

In genetics, underdominance (at times called "negative overdominance") is the opposite of overdominance.

It is the selection against the heterozygote, that leads to disruptive selection and divergent genotypes. It occurs in cases of inferior and reduced fitness (As in our case study, it is the different chromosomal fusions and inversions)

of the heterozygotic genotype to the dominant or recessive homozygotic genotype. It is unstable as it causes fixation of either allele.

Another example is the African butterfly species Pseudacraea eurytus, which makes use of Batesian mimicry to avoid predation. This species carries two alleles that gives a coloration that is alike to a different local butterfly species that is harmful to its predator. The butterflies who are heterozygous for this trait are observed to be intermediate in coloration and thus encounter an higher risk of predation and a decrease in the total fitness.

3 0
3 years ago
Indentify the error that occurred in meiosis II
erastova [34]

Answer:

Non-disjunction of chromosomes.

Explanation:

2 sets of Chromosomes are supposed to be separated into each daughter gamete cells but non disjunction occurred that resulted in both sets of chromosomes being isolated into 1 gamete and the other having no chromosome

3 0
3 years ago
Read 2 more answers
Describe two examples of experimental evidence that provide evidence that membrane proteins drift or move over time
aniked [119]

There are so many examples for that in different areas, like TPT1 experiment carried out in our lab recently.Here's one link: http://www.alfa-chemistry.com/tpt1-cas-167218-46-4-item-290583.htm

7 0
3 years ago
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