7C Thursday Week 3 Pre-Class Quiz

Questions and Answers

What is likely the reason male wasps keep visiting the flowers of the newly discovered orchid?

Male wasps are likely attracted by paracrine signals produced by the orchid.

Male wasps are likely attracted to the sweet nectar produced by the orchid.

The orchid might produce a pheromone similar to that produced by female wasps. (correct)

Male wasps are likely attracted by growth factors produced by the orchid.

Male wasps are likely attracted to the bright colors of the orchids' flowers.

What are chemical signals introduced by animals into their habitats called?

Neurotransmitters

Growth factors

Pheromones (correct)

Hormones

What type of growth factor mutation might cause defects in the formation of connective tissue in mutant mice?

Fibrinogen growth factors (FGFs) (correct)

Nerve growth factors (NGFs)

Histamine

Bone morphogenetic proteins (BMPs)

Neurotransmitters

How is synaptic signaling different from paracrine signaling?

Synaptic signaling specifically involves neurotransmitters that are released from neurons. Signup and view all the answers

Pheromones are generally detected by the vomeronasal organ in most mammals, reptiles, and amphibians.

True Signup and view all the answers

Which of the following statements about K-strategists is FALSE?

They give birth frequently. Signup and view all the answers

What was the single most important adaptation that led to the uncoupling of reproduction and the need for an aquatic habitat?

amniotic egg Signup and view all the answers

Ovulation is triggered by a surge of which hormone?

luteinizing hormone Signup and view all the answers

Which of the following does NOT occur during the follicular phase of the menstrual cycle?

Progesterone levels increase to high levels. Signup and view all the answers

In response to LH and FSH, what do testes secrete?

testosterone Signup and view all the answers

Which statement about the corpus luteum is FALSE?

The corpus luteum is maintained first by FSH and then by hCG. Signup and view all the answers

What is the CORRECT path taken by sperm from site of production to site of ejection?

Seminiferous tubules, epididymis, vas deferens, ejaculatory duct, urethra Signup and view all the answers

Oocytes are produced in which structure?

ovaries Signup and view all the answers

Study Notes

Orchid and Wasp Interaction

Male wasps are attracted to orchids, likely due to sweet nectar, signals, or pheromones.
Orchids may produce pheromones similar to those of female wasps for attraction.

Pheromones Definition

Pheromones are chemical signals introduced by animals into their habitats for communication, such as attracting mates and marking territories.

Mutant Mice Research

Mice with defective connective tissue are likely carrying mutations in genes encoding fibroblast growth factors (FGFs).

Synaptic vs. Paracrine Signaling

Synaptic signaling requires neurotransmitter release from neurons and acts over shorter distances compared to paracrine signaling.

Vomeronasal Organ

Pheromones in mammals, reptiles, and amphibians are typically detected by the vomeronasal organ.

K-strategists Characteristics

K-strategists produce few offspring, invest significantly in parental care, and thrive in stable environments with intense competition.

Adaptation in Land Animals

The amniotic egg is a crucial adaptation that allowed the uncoupling of reproduction from aquatic habitats as animals transitioned to land.

Ovulation Hormones

A surge in luteinizing hormone (LH) triggers ovulation.

Follicular Phase of Menstrual Cycle

During the follicular phase, progesterone levels do not increase to high levels, and the uterine lining is not shed.

Testosterone Secretion

In response to luteinizing hormone (LH) and follicle stimulating hormone (FSH), testes secrete testosterone.

Corpus Luteum Characteristics

The corpus luteum is responsible for progesterone secretion, which maintains the uterine lining, and it degenerates if fertilization does not occur.

Sperm Pathway

Sperm travel from seminiferous tubules to the urethra following the order: epididymis, vas deferens, and ejaculatory duct.

Oocyte Production

Oocytes are produced in the ovaries, which are the female reproductive organs responsible for egg development.

Description

Test your understanding of botanical interactions in the Amazon rainforest with this quiz. Explore the relationship between new orchid species and male wasp attraction. Delve into the ecological scenarios that explain this phenomenon.